CN106935005B - Test device and method for evaluating dust transient interference resistance of smoke detector - Google Patents
Test device and method for evaluating dust transient interference resistance of smoke detector Download PDFInfo
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- CN106935005B CN106935005B CN201710320609.0A CN201710320609A CN106935005B CN 106935005 B CN106935005 B CN 106935005B CN 201710320609 A CN201710320609 A CN 201710320609A CN 106935005 B CN106935005 B CN 106935005B
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- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/12—Checking intermittently signalling or alarm systems
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- G08B29/145—Checking intermittently signalling or alarm systems checking the detection circuits of fire detection circuits
Abstract
The invention provides a test device for evaluating the dust transient interference resistance of a smoke detector, which consists of a test box body, a dust generating device and a test parameter monitoring device. The invention also provides a test method for evaluating the dust transient interference resistance of the test device, which comprises the following steps: setting test conditions; placing two detector samples in a test box body, and enabling the two detector samples to be in a normal monitoring state and stably run for 15 min; and introducing dust at a certain speed, testing the response condition of the smoke detector, judging the dust resistance of the detector according to parameter standards of different dust interference resistance levels, and providing a basis for researching and applying the detector.
Description
The technical field is as follows:
the invention relates to performance detection of a smoke detector, in particular to a test device and a test method for evaluating the dust transient interference resistance of the smoke detector.
The background art comprises the following steps:
because the smoke detector adopts the light scattering principle, under the action of air current, dust enters into the detection cavity of the detector and can generate light scattering signals, so that the analog value of the detector is increased in a short time to generate false alarm, and the dust suspended in the air is the main reason for causing the false alarm of the smoke detector. An assessment by the International Association for Fire Safety Science (IAFSS), National Institute of Standards and Technology (NIST), and the institute of fire and fire engineers (SFPE) in the united states indicates that the reliability of smoke fire detection systems in homes, commercial buildings, and public institutions is between 67% and 86%, and that there is a great need for increased space.
Different brands of detectors have different short-time transient interference resistance to dust due to different identification algorithms and different detection cavity structures. In practical engineering application, dust concentrations in different places have large differences, for example, the content of particulate matters in air of common civil houses is low, the places such as semi-closed venues and tunnels are relatively high, and the dust concentrations in the outdoor places, industrial places and places with serious environmental interference are likely to be high. Therefore, smoke detectors should be used in specific environmental locations based on their resistance to dust transients. However, at present, a test device and a method capable of quantitatively evaluating the dust transient interference resistance of the smoke detector are still lacking at home and abroad.
GB/T2423.37-2006/IEC60068-2-68:1994 environmental test for electrical and electronic products, different methods for testing sand dust are specified for electrical and electronic products, and the general influence of the sand dust on the electrical and electronic products is mainly evaluated, such as contact failure caused by the sand dust, dead locking of a moving bearing, surface abrasion, blockage of a vent hole or a filter and the like. These test methods are not suitable for testing false alarm or working point drift of a fire detector caused by dust interference, so that the test methods are not adopted for testing the fire detector in the field of fire detection alarm. Furthermore, the dust test chamber specified in GB/T2423.37-2006/IEC60068-2-68:1994 environmental test for Electrical and electronic products cannot control the stability of dust concentration and therefore cannot be used for carrying out quantitative dust pollution tests of smoke detectors.
A dust test method of a fire detector is specified in US UL Standard (Smoke fire detector) 268-2006 for fire alarm signaling system and UL217-2015 Standard for safety alarm system, and aims to test whether the fire detector can still normally work after being polluted by large-concentration dust. However, the test device in the test can not realize the quantitative control of the internal dust concentration and can not carry out the quantitative evaluation of the dust transient interference resistance of the smoke fire detector.
The invention content is as follows:
aiming at the problems in the prior art, the invention aims to provide a test device and a test method for evaluating the dust transient interference resistance of a smoke detector, and provide a scientific basis for correctly evaluating the dust transient interference resistance of the smoke detector.
In order to achieve the purpose, the test device for evaluating the dust transient interference resistance of the smoke detector comprises a test box body, a dust generating device and a test parameter monitoring device, wherein a detector fixing disc is arranged on the inner side of the top wall of the test box body, the test parameter monitoring device comprises an anemometer, a hygrothermograph and an optical smoke densimeter, the anemometer and the hygrothermograph are arranged on the detector fixing disc, the optical smoke densimeter is arranged in the test box body, and two detector bases are symmetrically arranged on the detector fixing disc around the axis of the detector fixing disc; the test box body comprises an upper dust mixing area and a lower dust settling area, the side wall of the test box body corresponding to the upper dust mixing area is provided with a dust supplementing opening, the lower dust settling area is internally provided with a heater, the bottom of the test box body is connected with a circulating pump, the circulating pump is respectively connected with a dust conveying channel and a dust discharging channel, a dust blowing opening of the dust conveying channel is positioned in the upper dust mixing area, the dust discharging channel is connected with a dust discharging opening of the test box body, and an electric valve is arranged on the dust discharging channel; the dust generating device comprises an air compressor and a dust generator connected with the air compressor, and the dust generator is connected with the dust supplementing opening through a pipeline.
The test box body further comprises a control cabinet, the control cabinet controls the circulating pump, the heater, the oscillator and the electric valve to be started and closed, and the anemometer and the hygrothermograph are connected with a control panel of the control cabinet through serial ports.
The dust generator is provided with a knob for controlling the dust adding speed, and the dust adding speed range of the dust generator is 0.3-50 mg/s.
And the vertical distance from the dust blowing port to the side wall of the test box body where the dust supplementing port is positioned is equal to the vertical distance from the dust blowing port to the top wall of the test box body.
The straight line where the two detector bases are located is perpendicular to the airflow direction of the dust blowing port.
The measurement range of the dust optical concentration m value of the optical smoke density meter is at least 0-2dB/m, and the measurement precision is 0.01 dB/m.
The dust concentration range in the test box body is (1 mg/m)3-500mg/m3)±10％。
The invention also provides a test method for evaluating the dust transient interference resistance by using the test device for evaluating the dust transient interference resistance of the smoke detector, which comprises the following steps:
step 3, starting the heater and the circulating pump to enable the temperature and the relative humidity in the test chamber and the flow velocity of airflow around the smoke detector to meet the requirements of test conditions; start air compressor and dust generator, let in the dust with certain speed, the increase of the dust optical concentration m value in the proof box that makes the optics smoke density meter gather is in the certain limit, observes smoke detector's state simultaneously, and is concrete, divide into four grades to the experiment according to the difference of dust concentration, is the I level in the more serious place of simulation environmental disturbance respectively: the environmental parameters of the dust optical concentration m value is 0.5dB/m, the light reduction rate is 10.9%/m, and the simulation of the second level of a common place is as follows: the environmental parameters of the dust optical concentration m value is 0.088dB/m, the light reduction rate is 2%/m, and the third grade of a simulated clean place is as follows: the environmental parameters of the dust optical concentration m value is 0.035dB/m, the dimming ratio is 0.8%/m, and the fourth grade of the simulated dust-free place: the environmental parameters are that the optical concentration m value of the dust is less than 0.035dB/m, and the light-reducing rate is less than 0.8%/m; when two smoke detectors are subjected to level I and level II tests, the dust feeding rate is 0.19dBm -1min-1≤△m/△t≤0.418dBm-1min-1The increase range of the optical concentration m value of the dust in the test box body is 0-1 dB/m, and when m is 1dB/m or the m value is inWhen one smoke detector sends out an alarm signal, the test is finished, and when two smoke detectors carry out level III and level IV tests, the dust feeding rate can meet 0.015dBm-1min-1≤△m/△t≤0.1dBm-1min-1The increasing range of the optical dust concentration m value in the test box body is 0-0.088 dB/m, and the test is finished when m is 0.088dB/m or one smoke detector sends out an alarm signal;
and 4, judging according to the test result: when the dust concentration in the test box body reaches the dust concentration corresponding to the optical dust concentration m value under each test grade, the two smoke detectors do not give an alarm, the fact that the smoke detectors of the type pass the grade test is shown, and the highest grade passed by the smoke detectors of the type is used as the grade of the dust transient interference resistance of the smoke detectors.
According to the technical scheme, the invention has the beneficial effects that:
the testing device and the testing method can accurately control the dust concentration to increase at a certain speed under a smaller concentration, simulate the change of space dust similar to fire smoke, test the response condition of the smoke detector and evaluate the dust transient interference resistance of the smoke detector, thereby providing a basis for determining the environment place where the smoke detector is suitable for use.
Description of the drawings:
fig. 1 is a schematic structural diagram of a testing apparatus for evaluating dust transient interference resistance of a smoke detector according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a fixed disk of the detector in FIG. 1;
in this embodiment: 1-test box body, 2-detector fixing disc, 3-optical smoke density meter, 4-hygrothermograph, 5-anemometer, 6-dust blowing port, 7-dust supplementing port, 8-dust generator, 9-air compressor, 10-circulating pump, 11-heater, 12-electric valve, 13-dust discharging port, 14-control cabinet, 15-detector base, 16-control and display equipment connecting part, 17-air flow direction, 18-dust conveying channel and 19-dust discharging channel.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, the invention provides a test device for evaluating the dust transient interference resistance of a smoke detector, which comprises a test box body 1, a dust generating device and a test parameter monitoring device. The test box body 1 comprises an upper part and a lower part, wherein the upper part is in a cubic shape of 1000mm multiplied by 1000mm, the inner space of the upper part is in an upper dust mixing area, the lower part is in a regular four-pyramid shape with the bottom edge length of 1000mm and the height of 1000mm, and the inner space of the lower part is in a lower dust settling area. The left side wall of the test box body 1 corresponding to the upper dust mixing area is provided with a dust supplementing opening 7, and the vertical distance between the dust supplementing opening 7 and the bottom surface of the upper dust mixing area is 100 mm. The front side of the test box body is a door capable of being opened manually.
The heater 11 is arranged in the lower dust settling area, can heat the interior of the test box body 1 to 50 ℃ at most, and has the drying effect, so that the temperature and humidity in the test box body 1 are in a certain range; the bottom of the test box body 1 is connected with a circulating pump 10, the circulating pump 10 is respectively connected with a dust conveying channel 18 and a dust discharging channel 19, a dust blowing port 6 of the dust conveying channel 18 is positioned in the upper dust mixing area, the dust discharging channel 19 is connected with a dust discharging port 13 of the test box body 1, and an electric valve 12 is arranged on the dust discharging port; the sample box 1 further comprises a control cabinet 14, and the control cabinet 14 controls the on and off of the circulating pump 10, the heater 11 and the electric valve 12.
The dust generating device comprises an air compressor 9 and a dust generator 8, and dust generated by the dust generator 8 enters the test box body 1 through the dust supplementing opening 7. The dust generator 8 is connected with a computer through a serial port, the start and the close of the dust generator 8 can be controlled through a program in the computer, the dust adding speed of the dust generator can be controlled, and the dust adding speed range of the dust generator is 0.3-50 mg/s.
The test parameter monitoring device comprises an optical smoke density meter 3, an anemometer 5 and a hygrothermograph 4, wherein a detector fixing disc 2 with the diameter of 240mm is arranged on the inner side of the top wall of the test box body 1, as shown in fig. 2, the anemometer 5 and the hygrothermograph 4 are both arranged on the detector fixing disc 2, the optical smoke density meter 3 is fixed in the test box body 1 and is positioned in the upper dust mixing area, two detector bases 15 for fixing smoke detectors are symmetrically arranged on the detector fixing disc 2 in the front and back direction of the axis of the detector fixing disc, and the vertical distance from the dust blowing port 6 to the left side wall of the test box body 1 where the dust replenishing port 7 is positioned is equal to the vertical distance from the dust blowing port 6 to the top wall of the test box body 1 and is 200 mm; and the straight line where the two detector bases 15 are located is perpendicular to the airflow direction of the dust blowing port 6, so that the two smoke detectors are subjected to uniform airflow, and the dust concentration is basically consistent. The anemometer 5 and the hygrothermograph 4 are linked with a control panel of the control cabinet 14 through serial ports, so that the temperature, the humidity and the wind speed in the test box body 1 can be displayed on the control panel in real time; the optical smoke density meter 3 is connected with a computer through a serial port and used for collecting dust optical concentration data near the detector fixing disc 2 in the test box body 1 and displaying the data in real time through the computer, the dust optical concentration m value measuring range of the optical smoke density meter 3 at least reaches 0-2 dB/m, the precision is 0.01dB/m, and the computer adjusts the dust adding speed of the dust generator 8 according to data fed back by the optical smoke density meter 3 so as to adjust and control the dust concentration in the test box body 1.
In the test process, the compressed air generated by the air compressor 9 flows through the dust generator 8, the dust enters the test box body 1 through the dust supplementing opening 7, the circulating pump 10 can control the interior of the test box body 1 to form stable circulating air flow, referring to fig. 1, part of dust which is settled in the lower dust settling area can be blown out from the dust blowing opening 6 again, so that the dust forms a circulating passage, further, the dust generator 8 is provided with a knob for controlling the dust adding speed, the knob can be adjusted to supplement the dust in a trace manner in the dust circulating process, and the closed-loop control can realize that the dust concentration in the test box body 1 is (1 mg/m)3-500mg/m3) And +/-10% is controllable. The power of the circulation pump 10 is adjustable in such a way that the power range is such that the circulation pumpThe air flow speed near the detector fixing disc 2 is adjustable within the range of 0-2 m/s, and the adjustable precision can reach 0.05 m/s. And the standard atmospheric pressure is always kept in the test box body 1.
When the testing device is used for evaluating the dust transient interference resistance of the smoke detector, in order to apply the smoke detector to a specific environment place according to the dust transient interference resistance of the smoke detector, the dust transient interference resistance level standard of the smoke detector shown in the table 1 is given, and the dust transient interference resistance of the smoke detector and the place suitable for use are judged according to the table 1.
TABLE 1 grading of dust transient interference resistance for point type smoke sensing detection
The key parameter setting references referred to in table 1 are:
the optical dust concentration m value and the light reduction rate data of the same grade can be converted and correspond to each other one by one.
The m value of 0.5dB/m refers to the first-level sensitivity requirement of sensitivity division in the obsolete national standard GB4715-1993 Point type Smoke-sensing fire Detector technical requirement and test method. The dust concentration of the transient interference which can be resisted by the detector applied to a common place when the detector is arranged at the highest sensitivity (when the dust transient interference resistance is the worst) is the grading basis of the common place and a place with more serious environmental interference, namely, the detector does not give an alarm when the dust concentration reaches the parameter, the dust interference resistance of the detector is the strongest, the requirement of the I level is met, and the detector can be applied to the place with more serious environmental interference.
The dimming rate of 2%/m is a sensitive and common grading parameter in an air suction type response threshold value classification method in the national standard GB15631-2008 special fire detectors, and the type of the detector with the response threshold value larger than 2%/m is common. Namely, during transient interference test, the detector does not give an alarm when the dust concentration reaches the parameter, so that the detector has certain dust interference resistance, meets the II-level requirement, and can be applied to general places.
The classification parameters of sensitivity and high sensitivity in the air-breathing response threshold classification method in the national standard GB15631-2008 special fire detector are as follows: the response threshold value is more than 0.8%/m and less than or equal to 2%/m, so that the detector is sensitive, when the dust concentration reaches 0.8%/m in the transient interference test, the detector does not give an alarm, the dust interference resistance of the detector is poor, the requirement of grade III is met, and the method can be applied to clean places; the response threshold value is less than 0.8%/m, the detector is high in sensitivity, the detector gives an alarm before the dust concentration reaches 0.8%/m in the transient interference test, the detector does not have the dust interference resistance, meets the IV-level requirement, and is suitable for being used in dustless places.
Example 1:
a smoke fire detector of a certain model is installed in a tunnel, and the detector of the model needs to carry out I and II level dust transient interference tests. By utilizing the test device for evaluating the dust transient interference resistance of the smoke detector, the dust transient interference resistance of the smoke detector of the type is tested and evaluated according to the test method of the invention:
(1) setting the test conditions: the initial dust concentration in the test box body is lower than 0.01 dB/m; the temperature is 23 +/-5 ℃; relative humidity is less than 25%; the flow velocity of the airflow around the smoke detector is 0.5 +/-0.1 m/s;
(2) Selecting 2 smoke fire detectors of the type, wherein the response threshold values of the smoke fire detectors are set to be the same; the 2 smoke-sensitive fire detectors of the type are arranged on a detector fixing disc in a test box body and are connected to a fire alarm controller through a bus, so that the smoke-sensitive fire detectors are in a normal monitoring state and stably run for 15 min;
(3) starting the heater and the circulating pump to enable the temperature and the relative humidity in the test chamber and the flow rate of the airflow around the smoke detector to meet the requirements of test conditions; starting the air compressor and the dust generator, and ensuring that the dust introducing speed meets 0.19dBm-1min-1≤△m/△t≤0.418dBm-1min-1(refer to national standard GB4715-2005 appendix H test fire SH 2-cotton rope smoldering fire picture H.3 of Point type smoke-sensing fire detector), when m reaches 0.5dB/m, the 2 types of smoke-sensing fire detectors do not send out fire alarm signals;
(4) and (4) judging a conclusion: the detector meets the requirement of level I, has stronger dust interference resistance, and is suitable for places with more serious environmental interference (including tunnel places).
Example 2:
a smoke fire detector of a certain model is to be installed in an evacuation walkway, an elevator front room and a room of a hotel, and the detector of the model needs to carry out a dust transient interference test of I and II grades. By utilizing the test device for evaluating the dust transient interference resistance of the smoke detector, the dust transient interference resistance of the smoke detector of the type is tested and evaluated according to the test method of the invention:
(1) Setting the test conditions: the initial dust concentration in a test box body is lower than 0.01 dB/m; the temperature is 23 +/-5 ℃; relative humidity is less than 25%; the flow velocity of the airflow around the smoke detector is 0.5 +/-0.1 m/s;
(2) selecting 2 smoke fire detectors of the type, wherein the response threshold values of the smoke fire detectors are set to be the same; the 2 smoke-sensitive fire detectors of the type are arranged on a detector fixing disc in a test box body and are connected to a fire alarm controller through a bus, so that the smoke-sensitive fire detectors are in a normal monitoring state and stably run for 15 min;
(3) starting the heater and the circulating pump to enable the temperature and the relative humidity in the test chamber and the flow rate of the airflow around the smoke detector to meet the requirements of test conditions; starting the air compressor and the dust generator, and ensuring that the dust introducing speed meets 0.19dBm-1min-1≤△m/△t≤0.418dBm-1min-1(refer to national standard GB4715-2005 appendix H test fire SH 2-cotton rope smoldering fire picture H.3 of Point type smoke-sensing fire detector), when m reaches 0.088dB/m, one type of smoke-sensing fire detector sends out fire alarm signals, and the other type of smoke-sensing fire detector does not send out fire alarm signals;
(4) and (4) judging a conclusion: the detector does not meet the requirement of level II, has poor dust resistance, and is not suitable for being used in common places (including hotel evacuation walkways, elevator front rooms, rooms and the like).
Example 3:
a certain type of air suction type smoke-sensing fire detector is installed in a certain large machine room, and the detector of the type needs to carry out III and IV grade dust transient interference tests. By utilizing the test device for evaluating the dust transient interference resistance of the smoke detector, the dust transient interference resistance of the smoke detector of the type is tested and evaluated according to the test method of the invention:
(1) setting the test conditions: the initial dust concentration in a test box body is lower than 0.01 dB/m; the temperature is 23 +/-5 ℃; relative humidity is less than 25%; the flow velocity of the airflow around the smoke detector is 0.5 +/-0.1 m/s;
(2) selecting 2 smoke fire detectors of the type, wherein the response threshold values of the smoke fire detectors are set to be the same; the 2 smoke-sensitive fire detectors of the type are arranged on a detector fixing disc in a test box body and are connected to a fire alarm controller through a bus, so that the smoke-sensitive fire detectors are in a normal monitoring state and stably run for 15 min;
(3) starting the heater and the circulating pump to enable the temperature and the relative humidity in the test chamber and the flow rate of the airflow around the smoke detector to meet the requirements of test conditions; starting an air compressor and a dust generator, wherein the dust introducing speed meets the following requirements: 0.015dBm- 1min-1≤△m/△t≤0.1dBm-1min-1(refer to national standard GB4715-2005 smoke-sensitive fire detector section 4.1.5 response threshold measurement), when m value reaches 0.035dB/m, 2 said type smoke-sensitive fire detectors do not send out the fire alarm signal;
(4) And (4) judging a conclusion: the detector of the model can meet the requirements of class III and can be installed in clean places (including large machine rooms).
In the above 3 embodiments, the default selected smoke detector does not fail because the method of the present invention evaluates the dust interference resistance of the smoke detector, and the smoke detector needs to be evaluated under the condition of normal operation.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions and scope of the present invention as defined in the appended claims.
Claims (7)
1. The utility model provides a test device of evaluating smoke detector anti dust transient state interference performance which characterized in that includes: the device comprises a test box body, a dust generating device and a test parameter monitoring device, wherein a detector fixing disc is arranged on the inner side of the top wall of the test box body, the test parameter monitoring device comprises an anemometer, a hygrothermograph and an optical smoke densitometer, the anemometer and the hygrothermograph are arranged on the detector fixing disc, and two detector bases are symmetrically arranged on the detector fixing disc around the axis of the detector fixing disc; the test box body comprises an upper dust mixing area and a lower dust settling area, the side wall of the test box body corresponding to the upper dust mixing area is provided with a dust supplementing port, the lower dust settling area is internally provided with a heater, the bottom of the test box body is connected with a circulating pump, the circulating pump is respectively connected with a dust conveying channel and a dust discharging channel, a dust blowing port of the dust conveying channel is positioned in the upper dust mixing area, the dust discharging channel is connected with a dust discharging port of the test box body, and an electric valve is arranged on the dust discharging channel; the dust generating device comprises an air compressor and a dust generator connected with the air compressor, and the dust generator is connected with the dust supplementing port through a pipeline; and the vertical distance from the dust blowing port to the side wall of the test box body where the dust supplementing port is positioned is equal to the vertical distance from the dust blowing port to the top wall of the test box body.
2. The test apparatus for evaluating the dust transient interference resistance of a smoke detector as claimed in claim 1, wherein: the test box body further comprises a control cabinet, the control cabinet controls the circulating pump, the heater, the oscillator and the electric valve to be started and closed, and the anemometer and the hygrothermograph are connected with a control panel of the control cabinet through serial ports.
3. The test apparatus for evaluating the dust transient interference resistance of a smoke detector as claimed in claim 1, wherein: the dust generator is provided with a knob for controlling the dust adding speed, and the dust adding speed range of the dust generator is 0.3-50 mg/s.
4. The test apparatus for evaluating the dust transient interference resistance of a smoke detector as claimed in claim 1, wherein: the straight line where the two detector bases are located is perpendicular to the airflow direction of the dust blowing port.
5. The test apparatus for evaluating the dust transient interference resistance of a smoke detector as claimed in claim 1, wherein: the measurement range of the dust optical concentration m value of the optical smoke density meter is at least 0-2dB/m, and the measurement precision is 0.01 dB/m.
6. The test apparatus for evaluating the dust transient interference resistance of a smoke detector as claimed in claim 1, wherein: the dust concentration range in the test box body is (1 mg/m) 3-500mg/m3)±10％。
7. The test method for evaluating the dust transient interference resistance of the smoke detector according to claim 1 is characterized by comprising the following steps:
step 1, setting test conditions: the initial dust concentration in the test box body is lower than 0.01 dB/m; the temperature is 23 +/-5 ℃; the relative humidity is less than 25%; the flow velocity of the airflow around the smoke detector is 0.5 +/-0.1 m/s;
step 2, selecting two smoke detectors of the same type, wherein the smoke detectors with variable response thresholds are selected, the response thresholds are set identically, and then the smoke detectors are installed on a detector fixing disc in a test box body and are in a normal monitoring state and stably run for 15 min;
step 3, starting the heater and the circulating pump to enable the temperature and the relative humidity in the test chamber and the flow velocity of the airflow around the smoke detector to reach a testTesting the condition requirement; start air compressor and dust generator, let in the dust with certain speed, the increase of the dust optical concentration m value in the proof box that makes the optics smoke density meter gather is in the certain limit, observes smoke detector's state simultaneously, and is concrete, divide into four grades to the experiment according to the difference of dust concentration, is the I level in the more serious place of simulation environmental disturbance respectively: the environmental parameters of the dust optical concentration m value is 0.5dB/m, the light reduction rate is 10.9%/m, and the simulation of the second level of a common place is as follows: the environmental parameters of the dust optical concentration m value is 0.088dB/m, the light reduction rate is 2%/m, and the third grade of a simulated clean place is as follows: the environmental parameters of the dust optical concentration m value is 0.035dB/m, the dimming ratio is 0.8%/m, and the fourth grade of the simulated dust-free place: the optical concentration m value of the dust of the environmental parameters is less than 0.035dB/m, and the light-reducing rate is less than 0.8%/m; when two smoke detectors are subjected to level I and level II tests, the dust feeding rate is 0.19dBm -1min-1≤△m/△t≤0.418dBm-1min-1The increase range of the dust optical concentration m value in the test box body is 0-1 dB/m, when m is 1dB/m or one smoke detector sends an alarm signal, the test is finished, and when two smoke detectors carry out III and IV grade tests, the dust feeding speed can meet 0.015dBm-1min-1≤△m/△t≤0.1dBm-1min-1The increasing range of the optical dust concentration m value in the test box body is 0-0.088 dB/m, and the test is finished when m is 0.088dB/m or one smoke detector sends out an alarm signal;
and 4, judging according to the test result: when the dust concentration in the test box body reaches the dust concentration corresponding to the optical dust concentration m value under each test grade, the two smoke detectors do not give an alarm, the fact that the smoke detectors of the type pass the grade test is shown, and the highest grade passed by the smoke detectors of the type is used as the grade of the dust transient interference resistance of the smoke detectors.
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| US7030766B2 (en) * | 2003-06-18 | 2006-04-18 | Edwards Systems Technology, Inc. | Ambient condition detector with multi-function test |
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